diff --git a/packages/chatkit/types/index.d.ts b/packages/chatkit/types/index.d.ts
index 75451ea..556a18e 100644
--- a/packages/chatkit/types/index.d.ts
+++ b/packages/chatkit/types/index.d.ts
@@ -109,6 +109,13 @@ export type ChatKitOptions = {
    */
   entities?: EntitiesOption;
 
+  /**
+   * Configuration for the composer command menu.
+   *
+   * @see {@link CommandsOption}
+   */
+  commands?: CommandsOption;
+
   /**
    * Configuration for widgets.
    *
@@ -233,6 +240,22 @@ export type EntitiesOption = {
   ) => Promise<{ preview: Widgets.BasicRoot | null }>;
 };
 
+export type CommandsOption = {
+  /**
+   * Enables the "/" command menu, including applicable built-in composer actions.
+   */
+  enabled: boolean;
+
+  /** Returns integration-defined commands matching the input query. */
+  onSearch?: (query: string) => Promise<Command[]>;
+
+  /**
+   * Runs a command. Return an entity to insert it, another menu to continue
+   * command selection, or nothing when the command only performs an effect.
+   */
+  onSelect?: (command: Command) => Promise<void | CommandSelection>;
+};
+
 export type DisclaimerOption = {
   /** Markdown text displayed below the composer. */
   text: string;
@@ -597,6 +620,25 @@ export type Entity = {
   // Later: optional entity-specific tag display options (e.g. tag prefix)
 };
 
+/**
+ * An action that can be found from the composer's command menu.
+ */
+export type Command = {
+  id: string;
+  label: string;
+  description?: string;
+  icon?: ChatKitIcon;
+  group?: string;
+};
+
+/**
+ * Determines what ChatKit inserts or displays after a command is selected.
+ * Returning no selection lets the integration perform an effect outside ChatKit.
+ */
+export type CommandSelection =
+  | { type: 'entity'; entity: Entity }
+  | { type: 'menu'; commands: Command[] };
+
 /**
  * Identifies the tool that should run for a single message submission.
  * Mirrors the `ToolChoice` shape exposed by the chatkit-python SDK.